CN214304610U - Hydraulic control valve for tower crane jacking oil cylinder - Google Patents
Hydraulic control valve for tower crane jacking oil cylinder Download PDFInfo
- Publication number
- CN214304610U CN214304610U CN202022925046.8U CN202022925046U CN214304610U CN 214304610 U CN214304610 U CN 214304610U CN 202022925046 U CN202022925046 U CN 202022925046U CN 214304610 U CN214304610 U CN 214304610U
- Authority
- CN
- China
- Prior art keywords
- oil
- cavity
- valve
- oil cylinder
- way valve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Fluid-Pressure Circuits (AREA)
Abstract
The utility model provides a hydraulic control valve for a tower crane jacking oil cylinder, which comprises a one-way valve and a throttle valve; the one-way valve is arranged in a first cylindrical mounting hole which is formed in a cylindrical cylinder head body of the jacking oil cylinder and is axially processed inwards along the cylinder head body by an oil cylinder high-pressure volume cavity; the valve body is matched with the inner wall of the first cylindrical mounting hole, and the middle of the valve body is provided with a one-way valve cavity communicated with a high-pressure volume cavity of the oil cylinder; the middle of the one-way valve cavity is provided with a linear seal along the radial direction to divide the one-way valve cavity into a front one-way valve cavity communicated with the high-pressure volume cavity of the oil cylinder and a closed back one-way valve cavity. The utility model discloses in, integrate the check valve in cylindrical valve body, liquid accuse valve simple structure, processing is convenient.
Description
Technical Field
The utility model relates to a tower crane jacking hydro-cylinder oil circuit control system field, especially a tower crane is hydraulic control valve for jacking hydro-cylinder.
Background
In a traditional tower crane jacking oil cylinder, in order to realize slow tower descending during tower dismantling and tower descending and fast action during tower ascending and no-load return, a large check valve, a small check valve and a throttle valve are frequently required to be combined to realize the function, the number of valves is large, and a large installation space is required.
Or a combined valve for the tower crane jacking oil cylinder is adopted, and the combined valve for the tower crane jacking oil cylinder is provided by the Chinese utility model patent authorization publication No. CN 209539678U, wherein the valve utilizes an outer valve body to install a large one-way valve, a small one-way valve and a throttle valve; and then the outer valve body is arranged on the oil cylinder, and the oil duct is communicated with the oil cylinder volume cavity by utilizing a welding pipeline.
The combined valve has high requirements on the welding and sealing performance of the pipeline, and increases the risk of external leakage; and the outer valve body protrudes out of the jacking oil cylinder, so that the installation space of the tower crane is increased, the jacking oil cylinder is easy to collide when being installed and hoisted, and the precision and the service life of the valve bank are influenced.
SUMMERY OF THE UTILITY MODEL
The utility model aims at the problems that the existing tower crane jacking oil cylinder uses the valve group to realize slow tower descending when disassembling the tower and descending the tower, and can quickly act when ascending the tower and returning in a no-load way, and the traditional valve group has more valve cores and is complex to process; the combined valve has high risk of external leakage, large installation space of the tower crane and easy collision; a hydraulic control valve for a tower crane jacking oil cylinder is provided.
The utility model discloses a technical scheme who adopts for realizing above technical requirement is: a hydraulic control valve for a tower crane jacking oil cylinder comprises a one-way valve and a throttle valve; the one-way valve is arranged in a first cylindrical mounting hole which is formed in a cylindrical cylinder head body of the jacking oil cylinder and is axially processed inwards along the cylinder head body by an oil cylinder high-pressure volume cavity; the valve body is matched with the inner wall of the first cylindrical mounting hole, and the middle of the valve body is provided with a one-way valve cavity communicated with a high-pressure volume cavity of the oil cylinder; the middle of the one-way valve cavity is provided with a linear seal along the radial direction to divide the one-way valve cavity into a first oil cavity and a second oil cavity which are communicated with a high-pressure volume cavity of the oil cylinder;
in the front one-way valve cavity, the one-way valve cavity and the oil cylinder high-pressure volume cavity are separated by a cover cap, and a through hole is formed in the middle of the top of the cover cap to form a C3 oil channel from the oil cylinder high-pressure volume cavity to the one-way valve cavity; a first spring is arranged on the inner side of the cap along the cap wall, and a first spring seat is arranged outside the cap opening of the cap; the first spring seat is arranged in a bell-shaped first one-way valve core of which the outer wall is matched with the inner wall of the front cavity, a through hole is arranged on the top of the first one-way valve core to form an A2 oil channel, a ball-shaped second one-way valve core is arranged at an A2 oil channel opening, the second one-way valve core is propped by a conical spring, and the conical spring is arranged on the first spring seat and is opposite to the first spring;
in the second oil cavity, the bottom is provided with a control piston, a second spring is arranged between the control piston and the partition wall, the side wall of the second oil cavity formed between the control piston and the rear partition wall is communicated with an oil passage A through an oil passage A1, and the oil passage A is communicated with the oil tank;
an A3 oil passage communicated with the second oil chamber and the first oil chamber is arranged on the on-line seal;
the throttle valve is arranged in a second cylindrical mounting hole which is formed in the side surface of the cylinder head of the jacking oil cylinder and faces the radial direction, a C2.1 oil duct which is parallel to the axial direction of the jacking oil cylinder is arranged between the second cylindrical mounting hole and the oil cylinder high-pressure volume cavity, and a C2.2 oil duct which is parallel to the radial direction of the jacking oil cylinder is arranged between the second cylindrical mounting hole and the first cylindrical mounting hole; the top of the throttle valve core forms a conical top, and the conical top enters the C2.2 oil duct from the second cylindrical mounting hole to form a throttling K port.
Further, among foretell tower machine jacking hydraulic control valve for hydro-cylinder: a first rubber sealing element, a second rubber sealing element and a third rubber sealing element are sequentially arranged between the valve body and the inner wall of the first cylindrical mounting hole; a fourth rubber sealing element is arranged between the outside of the spring seat and the valve core; and a fifth rubber sealing element is arranged between the throttle valve core and the inner wall of the second cylindrical mounting hole.
Further, among foretell tower machine jacking hydraulic control valve for hydro-cylinder: a first hole elastic check ring is arranged between the valve body and the orifice of the first cylindrical mounting hole, a second hole elastic check ring is arranged between the cap edge of the cap and the cavity wall of the front one-way valve cavity, and a third hole elastic check ring is arranged between the control piston and the cavity wall of the rear one-way valve cavity; the elastic check ring for the first hole, the elastic check ring for the second hole and the elastic check ring for the third hole all conform to the GB893.1-86 standard.
The utility model discloses in, integrate in cylindrical valve body with the check valve, liquid accuse valve simple structure.
In addition, only a cylindrical mounting seat hole needs to be machined in the center of the cylinder head body during machining, machining difficulty is low, production cost is saved, and output benefit is improved.
The hydraulic control valve is arranged in the cylinder head body, so that the welding or the bolt connection of a hard pipe from a high-pressure cavity of the oil cylinder to the valve is omitted, and the oil in the rodless cavity of the oil cylinder, caused by the reasons of hard pipe damage, sealing failure, bolt fracture, welding seam crack and the like, is effectively prevented from being rapidly leaked. The quick leakage of the oil in the rodless cavity can cause the quick drop of the upper rotating part of the tower crane, and accidents are easy to happen. Meanwhile, the influence of collision when the hoisting oil cylinder is installed at the initial stage of the tower crane on the valve precision and the service life is effectively avoided.
The present invention will be further described with reference to the accompanying drawings and the detailed description.
Drawings
Fig. 1 is the utility model discloses tower machine is hydraulic control valve for jacking cylinder block diagram (one) of embodiment 1.
Fig. 2 is the utility model discloses tower machine is hydraulic control valve oil duct and oil pocket distribution diagram for jacking cylinder of embodiment 1.
Detailed Description
Embodiment 1, this embodiment is a hydraulic control valve for a tower crane jacking cylinder, and as shown in fig. 1, the hydraulic control valve for a tower crane jacking cylinder of this embodiment includes a check valve 200 and a throttle valve 300 installed in a cylindrical cylinder head body 101 of a jacking cylinder 100. Wherein the check valve 200 is installed in a first cylindrical installation hole 103 which is formed in the cylindrical cylinder head body 101 of the jacking cylinder 100 along the axial direction in the cylinder head body 101 by a cylinder high-pressure volume cavity C; the throttle valve 300 is disposed in a second cylindrical mounting hole 104 formed in a side surface of the head body 101 of the lift cylinder 100 facing in the radial direction.
The structure of the check valve 200 is shown in fig. 1, and comprises a valve body 204 matched with the inner wall of the first cylindrical mounting hole 103, wherein the middle of the valve body 204 is provided with a first check valve cavity QC1 communicated with the cylinder high-pressure volume cavity C; a linear seal 220 is arranged in the middle of the first one-way valve cavity QC1 along the radial direction to divide the inner cavity of the valve body 204 into a first oil cavity QC1 and a second oil cavity QA which are communicated with the cylinder high-pressure volume cavity C, and the second oil cavity QA is arranged at the far end of the cylinder high-pressure volume cavity C.
In the front one-way valve cavity, the first one-way valve cavity QC1 and the oil cylinder high-pressure volume cavity C are separated by a cap 203, and a through hole is formed in the middle of the top of the cap 203 to form a C3 oil channel from the oil cylinder high-pressure volume cavity C to the first one-way valve cavity QC 1; the C3 oil passage and the following a oil passage are numbers coded in the manner of english letters plus numbers for distinguishing the oil passage surfaces, and are just for distinguishing the oil passage surfaces like the first oil passage, the second oil passage and the like, and A, B, C and the like have no other practical meanings. A first spring 212 is arranged on the inner side of the cap 203 along the cap wall, and a first spring seat 202 is arranged outside the cap opening of the cap 203; the first spring seat 202 is arranged in a bell-shaped valve core 201, the outer wall of the bell-shaped valve core 201 is matched with the inner wall of the front cavity, a through hole is formed in the top of the valve core 201 to form an A2 oil passage, a ball-shaped second one-way valve core 205 is arranged at the A2 oil passage, in the embodiment, a steel ball is supported by a conical spring 213, and the conical spring 213 is arranged on the first spring seat 202 and is opposite to the first spring 212.
The bottom of the second oil chamber QA is provided with a control piston 206, a second spring 211 is arranged between the control piston 206 and a partition wall 221, the side wall of the QA oil chamber formed between the control piston 206 and the linear seal 220 is communicated with an oil passage a through an oil passage a1, and the oil passage a leads to the oil tank; in practice, the oil passage a is an oil passage that pumps oil from the tank into the lift cylinder 100 with a pump when the lift cylinder 100 is raised. An A3 oil passage communicated with the first one-way valve cavity and the second one-way valve cavity is arranged on the online seal 220 partition 221; in order to prevent the oil cylinder high-pressure volume cavity C and the oil duct A from being communicated with each other outside the valve body 204 to cause leakage, a first rubber sealing element 10-1, a second rubber sealing element 10-2 and a third rubber sealing element 10-3 are sequentially arranged between the valve body 204 and the inner wall of the first cylindrical mounting hole 103, so that the oil cylinder high-pressure volume cavity 102 is prevented from being communicated with the oil duct A through the first cylindrical mounting hole 103 to cause leakage.
The throttle valve 300 is arranged in a second cylindrical mounting hole 104 which is formed in the side surface of the cylinder head body 101 of the jacking oil cylinder 100 in the radial direction, a C2.1 oil duct which is parallel to the axial direction of the jacking oil cylinder 100 is arranged between the second cylindrical mounting hole 104 and the oil cylinder high-pressure volume cavity 102, and a C2.2 oil duct which is parallel to the radial direction of the jacking oil cylinder 100 is arranged between the second cylindrical mounting hole 104 and the first cylindrical mounting hole 103; the top of the throttle valve core 301 forms a conical top 302, and enters the C2.2 oil passage from the second cylindrical mounting hole 104 to form a throttle K port. In order to prevent leakage, a fourth rubber seal 10-4 is arranged between the outside of the spring seat 202 and the valve core 201; a fifth rubber seal 10-5 is provided between the throttle valve spool 301 and the inner wall of the second cylindrical mounting hole 104. A first hole circlip 270 is arranged between the valve body 204 and the orifice of the first cylindrical mounting hole 103, a second hole circlip 235 is arranged between the cap edge of the cap 203 and the wall of the front check valve cavity, and a third hole circlip 230 is arranged between the control piston 206 and the wall of the rear check valve cavity; the first circlip 270 for holes, the second circlip 235 for holes, and the third circlip 230 all comply with the GB893.1-86 standard.
The following is a description of the installation, assembly and structure of the hydraulic control valve for the tower crane jacking cylinder of the embodiment with reference to fig. 2 and fig. 1:
before installation, corresponding cylindrical mounting holes, namely a first cylindrical mounting hole 103, and corresponding throttle mounting holes, namely a second cylindrical mounting hole 104, threads, a sealing element annular groove, an oil passage A, an oil passage B and an oil passage C2.1, need to be machined in advance on the cylinder head body 101. The oil passages a and B are directed from both sides of the cylinder head 101 toward the first cylindrical mounting hole 103, respectively, and the oil passage C2.1 is connected from the cylinder high-pressure volume chamber 102 to the second cylindrical mounting hole 104 in the axial direction of the lift cylinder 100.
The ball type second check valve spool 205, the conical spring 213 and the spring seat 202 are installed in the bell jar type first check valve spool 201, and the diameter of the ball type second check valve spool 205 is larger than that of the A2 oil passage. The spring seat 202 is connected with the valve core 201 through threads, a certain pressing force is applied to the conical spring 213, the other end of the conical spring 213 is in contact with the ball-shaped second check valve core 205, the diameter of the conical spring is slightly smaller than that of the ball-shaped second check valve core 205, the ball-shaped second check valve core 205 is pressed to the inner linear sealing hole 222 of the valve core 201 through the spring, and the oil cavity QA and the oil cavity QC2 are sealed, as shown in FIG. 2.
The bell-type first check valve spool 201, the first spring 212, and the cap 203 are fitted into the valve body 204. The cap 203 is fixed by the circlip 35 for hole, and applies a certain pressing force to the first spring 212, and the other end of the first spring 212 contacts the first spring seat 202. The cap 202 and the bell-shaped first check valve core 201 are pressed to the linear sealing hole 220 in the valve body 204 by the first spring 212, and the conical surface of the bell-shaped first check valve core 201 is tightly attached to the linear sealing hole 220 to separate the oil cavity QA from the oil cavity QC 1. The cap 3 is provided with an oil passage C3 in the middle.
The control piston 206 and the second spring 211 are assembled into the valve body 204 and fixed by the circlip 230 for the second hole, and one end of the second spring 211 is positioned in the groove of the control piston 206 and the other end is in contact with the partition wall 221. The control piston 206 has stepped push rods, including a small push rod and a large push rod. Wherein, the diameter of the small push rod is smaller than the diameter of an A2 oil passage; the diameter of the large push rod is larger than that of the A2 oil channel and smaller than that of the A3 oil channel. As shown in fig. 2.
The first, second and third rubber seals 10.1, 10.2, 10.3 are mounted in the cylinder head body 7, and then the valve body 204 is assembled into the cylinder head body 101, and the bore is fixed by the circlip 70.
The throttle valve is mounted in a second cylindrical mounting hole 104 of a cylinder head body 101, and the throttle valve 300 is screwed into the second cylindrical mounting hole 104 and mounted between the throttle valve 300 and the cylinder head body by mounting screw holes. The top of a throttle valve core 301 in the throttle valve 300 is provided with a conical center 302, and the drift diameter area of a throttle opening K can be adjusted.
The use process of the hydraulic control valve for the tower crane jacking oil cylinder of the embodiment is explained at first:
code number description:
FA 3: thrust of oil chamber QA oil to bell-type first one-way valve core 201
FA 2: thrust of oil chamber QA oil to ball type second check valve element 205
FC 3: thrust of oil chamber QC3 oil to bell-type first check valve core 201
FC 2: thrust of oil chamber QC2 oil on ball type second one-way valve core 205
F12: the first spring 212 presses the force
F13: conical spring 213 pressing force
FB: thrust of oil chamber QB oil against control piston 206
Firstly, quick jacking:
when jacking, the pumping station high-pressure oil is supplied to the oil duct A, and the oil enters the oil cavity QA from the oil duct A and the oil duct A1.
The oil in the cylinder high-pressure volume chamber C of the lift-up cylinder 100 acts on the bell-shaped first check valve element 201 and the spring seat 202 through the oil passage C3, and a certain acting force FC3 is applied. Meanwhile, oil enters the oil cavity QC2 through the oil passage C2.1, the throttling port K, the oil passage C2.2 and the oil passage C2.3, acts on the ball-shaped second one-way valve core 205, and exerts a certain acting force FC 2.
When the thrust FA3 of the oil chamber QA to the bell-type first check valve core 201 is larger than the sum of FC3 and the pressing force F12 of the first spring 212, the oil pushes the valve core 201 away through the A3 oil passage, and the conical surface of the valve core leaves the linear sealing hole 220.
When the thrust FA2 of the oil in the oil chamber QA against the ball-type second check valve spool 205 is larger than the sum of FC2 and the pressing force F13 of the conical spring 213, the oil pushes open the ball-type second check valve spool 205 through the oil passage a2, which leaves the line seal hole 222.
The oil chamber QA pressure oil enters the oil chamber QC1 through an oil passage A3, and then enters the rodless chamber C of the oil cylinder through an oil passage C1. And simultaneously enters an oil cavity QC2 through an oil passage A2, and then enters an oil cylinder rodless cavity C through oil passages C2.3 and C2.2 and throttling ports K and C2.1. And realizing full-flow quick jacking.
II, rapidly retracting the cylinder in an idle load manner:
at this time, the pump station low-pressure oil is supplied to the oil passage B and then enters the oil cavity QB through the oil passage B1, so that the control piston 206 is pushed. When the oil cylinder is unloaded, the oil pressure of the rodless cavity C of the oil cylinder is low, and FC2 and FC3 are small. When the thrust FB of the low-pressure oil in the oil chamber QB applied to the control piston 206 is larger than FC2+ F13+ FC3+ F12, the control piston 6 can push open the ball-type second check valve body 205 and the bell-jar-type first check valve body 201.
Oil in the rodless cavity C of the oil cylinder flows to the oil cavity QC1 through an oil passage C1 and then flows to the oil cavity QA through an oil passage A3. Meanwhile, the oil flows to an oil cavity QC2 through an oil passage C2.1, a throttling port K, a throttling port C2.2 and a throttling port C2.3, and then flows to an oil cavity QA through an A2 oil passage. Oil in the oil cavity QA flows back to the oil tank through the A1 oil passage A1 and the A oil passage A.
At the moment, the oil return drift diameter is large, the oil return flow is large, and the quick return stroke of the oil cylinder in no-load can be realized.
Thirdly, loading a slow descending tower:
when the tower crane is used for disassembling or lowering the tower, the self weight of the tower crane acts on a rodless cavity C of an oil cylinder, the oil pressure in the oil cavity is high, the acting force FC3 acting on the bell jar type first one-way valve core 201 is large, and the acting force FC2 acting on the ball type second one-way valve core 205 is far smaller than FC3 because the stressed area of the ball type second one-way valve core 205 is far smaller than that of the bell jar type first one-way valve core 201.
The pump station low pressure oil is supplied to the oil passage B and then enters the oil cavity QB through the oil passage B1 to push the control piston 206. The pressure of the oil in the control oil chamber QB is such that the control piston thrust FB is greater than FC2 and much less than FC 3. The control piston 206 jacks the ball-type second check valve core 205, but the jack cannot jack the bell jar-type first check valve core 201.
At the moment, high-pressure oil C2.1 in the rodless cavity C of the oil cylinder flows to an oil cavity QC2 through an oil passage A2 and an oil cavity QA through a throttling port K, C2.2.2 and C2.3, and then returns to the oil tank through oil passages A1 and A.
The throttle valve can be adjusted to control the area of the throttle opening K, so that the oil flow from the oil duct C2.1 to the oil duct C2.2 is controlled, the flow from the rodless cavity C of the oil cylinder to the oil tank is controlled, and the purpose of controlling the descending speed of the oil cylinder is achieved.
At the moment, the oil return drift diameter is adjustable, the oil return flow is adjustable, the slow return stroke of the oil cylinder during loading can be realized, and the return stroke speed is adjustable.
Claims (3)
1. A hydraulic control valve for a tower crane jacking cylinder comprises a one-way valve (200) and a throttle valve (300); the method is characterized in that: the check valve (200) is arranged in a first cylindrical mounting hole (103) which is formed in a cylindrical cylinder head body (101) of the jacking oil cylinder (100) and is axially and inwards machined along the cylinder head body (101) by an oil cylinder high-pressure volume cavity (C); the oil cylinder high-pressure volume cavity valve comprises a valve body (204) matched with the inner wall of a first cylindrical mounting hole (103), wherein a one-way valve cavity communicated with an oil cylinder high-pressure volume cavity (C) is formed in the middle of the valve body (204); a linear seal (220) is arranged in the middle of the one-way valve cavity along the radial direction to divide the one-way valve cavity into a first oil cavity (QC1) and a second oil cavity (QA) which are communicated with a high-pressure volume cavity (C) of the oil cylinder;
the first oil cavity (QC1) and the oil cylinder high-pressure volume cavity (C) are separated by a cover cap (203), a through hole is formed in the middle of the top of the cover cap (203) to form a C3 oil channel from the oil cylinder high-pressure volume cavity (C) to the first oil cavity (QC 1); a first spring (212) is arranged on the inner side of the cover cap (203) along the cap wall, and a first spring seat (202) is arranged outside the cap opening of the cover cap (203); the first spring seat (202) is arranged in a bell-shaped first one-way valve core (201) with the outer wall matched with the inner wall of the front cavity, a through hole is formed in the top of the first one-way valve core (201) to form an A2 oil channel, a ball-shaped second one-way valve core (205) is arranged at an A2 oil channel opening, the second one-way valve core (205) is propped by a conical spring (213), and the conical spring (213) is arranged on the first spring seat (202) and is opposite to the first spring (212);
a control piston (206) is arranged at the bottom of the second oil chamber (QA), and a partition wall (221) is radially arranged at the top of the second oil chamber; a second spring (211) is arranged between the control piston (206) and the partition wall (221), the side wall of the second oil cavity (QA) is communicated with an oil channel A through an oil channel A1, and the oil channel A leads to the oil tank;
an A3 oil passage communicated with the second oil chamber (QA) and the first oil chamber (QC1) is arranged on the online seal (220);
the throttle valve (300) is arranged in a second cylindrical mounting hole (104) which is formed in the radial direction on the side surface of a cylinder head body (101) of the jacking oil cylinder (100), a C2.1 oil duct which is parallel to the axial direction of the jacking oil cylinder (100) is arranged between the second cylindrical mounting hole (104) and the oil cylinder high-pressure volume cavity (C), and a C2.2 oil duct which is parallel to the radial direction of the jacking oil cylinder (100) is arranged between the second cylindrical mounting hole (104) and the first cylindrical mounting hole (103); the top of the throttle valve core (301) forms a conical top (302) which enters the C2.2 oil passage from the second cylindrical mounting hole (104) to form a throttle K port.
2. The hydraulic control valve for the tower crane jacking oil cylinder according to claim 1, characterized in that: a first rubber sealing element (10-1), a second rubber sealing element (10-2) and a third rubber sealing element (10-3) are sequentially arranged between the valve body (204) and the inner wall of the first cylindrical mounting hole (103); a fourth rubber sealing element (10-4) is arranged between the outside of the spring seat (202) and the valve core (201); and a fifth rubber sealing element (10-5) is arranged between the throttle valve core (301) and the inner wall of the second cylindrical mounting hole (104).
3. The hydraulic control valve for the tower crane jacking oil cylinder according to claim 1, characterized in that: a first elastic check ring (270) for holes is arranged between the valve body (204) and the orifice of the first cylindrical mounting hole (103), a second elastic check ring (235) for holes is arranged between the brim of the cover cap (203) and the wall of the front one-way valve cavity, and a third elastic check ring (230) for holes is arranged between the control piston (206) and the wall of the rear one-way valve cavity; the first hole circlip (270), the second hole circlip (235) and the third hole circlip (230) all conform to the GB893.1-86 standard.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022925046.8U CN214304610U (en) | 2020-12-09 | 2020-12-09 | Hydraulic control valve for tower crane jacking oil cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022925046.8U CN214304610U (en) | 2020-12-09 | 2020-12-09 | Hydraulic control valve for tower crane jacking oil cylinder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214304610U true CN214304610U (en) | 2021-09-28 |
Family
ID=77853886
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022925046.8U Active CN214304610U (en) | 2020-12-09 | 2020-12-09 | Hydraulic control valve for tower crane jacking oil cylinder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214304610U (en) |
-
2020
- 2020-12-09 CN CN202022925046.8U patent/CN214304610U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110792650B (en) | Threaded cartridge type load retaining valve | |
| CN102434530A (en) | Differential-type plunger composite oil cylinder | |
| GB2028953A (en) | An Internal Combustion Engine with Exhaust Braking | |
| CN201610828U (en) | Ultrahigh pressure plunger cleaning pump and automatic aligning structure of plunger component thereof | |
| CN214304610U (en) | Hydraulic control valve for tower crane jacking oil cylinder | |
| CN113417900B (en) | Integrated high-pressure large-flow proportional overflow type unloading valve | |
| CN200964939Y (en) | Diaphragm meter pump rear oil-supply control device | |
| CN201513698U (en) | Pneumatic adjustable lubricating oil pump used for diesel hammer | |
| CN109237056B (en) | Cartridge formula preforming valve | |
| CA1271085A (en) | Fluid pressure intensifier | |
| CN201288862Y (en) | Pilot-operated check valve | |
| CN113074107A (en) | Hydraulic end of reciprocating pump | |
| CN205243994U (en) | Hydraulic drive hydrostatic test high pressure unloading valve | |
| CN114215726A (en) | Membrane head structure of diaphragm compressor | |
| CN109695754B (en) | Hydraulic oil inlet valve | |
| CN109026888B (en) | Rotary buffer valve | |
| CN113323935A (en) | Novel check valve buffer structure | |
| CN203497996U (en) | Pneumatic hydraulic jack | |
| CN219588194U (en) | Hydraulic control one-way valve | |
| CN215672665U (en) | Hydraulic end of reciprocating pump | |
| CN218479990U (en) | High-pressure oil-supplementing overflow valve | |
| CN216478121U (en) | Embedded back pressure valve rod assembly structure | |
| CN220929824U (en) | Floating type two-way cartridge valve | |
| CN112815106B (en) | High-pressure descaling injection valve and pneumatic control method | |
| CN114135534B (en) | Tower crane jacking hydraulic system with micro-motion control and back pressure matching functions and control valve group |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |